What is the use of uniq?

The uniq command can count and print the number of repeated lines. Just like duplicate lines, we can filter unique lines (non-duplicate lines) as well and can also ignore case sensitivity. We can skip fields and characters before comparing duplicate lines and also consider characters for filtering lines.

What is uniq number?

The uniq command in Linux is a command line utility that reports or filters out the repeated lines in a file. In simple words, uniq is the tool that helps to detect the adjacent duplicate lines and also deletes the duplicate lines.

What is uniq in bash?

uniq command is used to detect the adjacent lines from a file and write the content of the file by filtering the duplicate values or write only the duplicate lines into another file. …

What does uniq do in Unix?

uniq is a utility command on Unix, Plan 9, Inferno, and Unix-like operating systems which, when fed a text file or STDIN, outputs the text with adjacent identical lines collapsed to one, unique line of text.

Which is the best example of Uniq in Linux?

7 examples of the uniq command in Linux. Example 1: Using uniq command the default way. Example 2: Output filtered results to destination file. Example 3: Using ‘-c’ to get the count of repeated lines. Example 4: Only print repeated lines with ‘-d’. Example 5: Only print unique lines with ‘-u’. Example 6: Ignore fields or characters with uniq

How to print only unique lines in UNIQ?

For example, line “aa” was there twice in the test file, so the following uniq command displayed the line “aa” twice in this output. 4. Print only Unique Lines using -u option This option is to print only unique lines in file. If you like to delete duplicate lines from a file using certain pattern, you can use sed delete command. 5.

How to show the number of repetitions in UNIQ?

If you want, you can also make uniq display in output the number of times a line is repeated. This can be done by using the -c command line option. For example, the following command: So as you can see, the number of repetitions for each line is prefixed before it in the output. 3. How to only print duplicate lines using uniq

What can you do with the uniq command?

It can be used by itself but it is commonly used in along with other commands like to identify redundant information in a file. When you run uniq without options it will use the stdin and stdout for input and output. While using stdin is possible using the clipboard (copy/paste), this isn’t the most practical use.